Add OpenAPI docs, frontend, migrations, and API updates

- OpenAPI: add missing endpoints (add-from-url, subscriptions, public availability)
- OpenAPI: CalendarSubscription schema, Subscriptions tag
- Frontend app
- Migrations: count_for_availability, subscriptions_sync, user_preferences, calendar_settings
- Config, rate limit, auth, calendar, booking, ICS, availability, user service updates

Made-with: Cursor

frontend/node_modules/date-fns/isSameYear.js

@@ -0,0 +1,36 @@
+import { normalizeDates } from "./_lib/normalizeDates.js";
+
+/**
+ * The {@link isSameYear} function options.
+ */
+
+/**
+ * @name isSameYear
+ * @category Year Helpers
+ * @summary Are the given dates in the same year?
+ *
+ * @description
+ * Are the given dates in the same year?
+ *
+ * @param laterDate - The first date to check
+ * @param earlierDate - The second date to check
+ * @param options - An object with options
+ *
+ * @returns The dates are in the same year
+ *
+ * @example
+ * // Are 2 September 2014 and 25 September 2014 in the same year?
+ * const result = isSameYear(new Date(2014, 8, 2), new Date(2014, 8, 25))
+ * //=> true
+ */
+export function isSameYear(laterDate, earlierDate, options) {
+  const [laterDate_, earlierDate_] = normalizeDates(
+    options?.in,
+    laterDate,
+    earlierDate,
+  );
+  return laterDate_.getFullYear() === earlierDate_.getFullYear();
+}
+
+// Fallback for modularized imports:
+export default isSameYear;